Abstract
The percentage of cranial vascular volume that undergoes arterial pulsations is estimated by 18 paired measurements in nine healthy volunteers using near infrared spectroscopy (NIRS, 10 Hz sampling frequency, 769 nm). The NIR absorption is decomposed in pulsatile and non-pulsatile components by digital filtering. The time course of absorption changes of these components after sudden intravenous injection of indocyanine-green (ICG) is used to estimate the arterial fraction of vascular volume (f art ). Approximately 28% of the vascular volume within the optical field of the NIR spectroscope was arterial. The range of values was 6 – 43%. Variance of f art was 4.8 times higher between subjects than within subjects, indicating that the variability observed is not due to imprecise estimation but to optode position and subject.
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Abbreviations
- A tot ,A art ,A ven ,A p :
-
NIR absorptions originating in volumes with corresponding indices
- A p :
-
instantaneous power of pulsatile absorption
- A np :
-
non-pulsatile absorption originating inA ven and
$$ \bar{V} $$art
- f art :
-
arterial fraction of arterial vascular volume
References
Oppenheim AV and Schafer RW. Discrete-Time Signal Processing. In: Prentice Hall Signal Processing Series 1st ed. Englewood Cliffs: Prentice Hall, 1989.
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© 2003 Springer Science+Business Media New York
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Stingele, R., Keller, E., Wagner, B.P., Steiner, T., Stingele, K., Hacke, W. (2003). Arterial Pulsations are Present in One Third of the Human Cranial Vascular Volume Penetrated by Near Infrared Light. In: Dunn, J.F., Swartz, H.M. (eds) Oxygen Transport to Tissue XXIV. Advances in Experimental Medicine and Biology, vol 530. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0075-9_6
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DOI: https://doi.org/10.1007/978-1-4615-0075-9_6
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